WASHINGTON_A top senator is calling for fines of up to $3,800 on families who fail to get medical insurance after a health care overhaul goes into effect.

The plan from Democratic Sen. Max Baucus of Montana would make health insurance mandatory, just like auto coverage. It would provide tax credits to help cover the cost for people making up to three times the federal poverty level. That's about $66,000 for a family of four, and $32,000 for an individual.

But those who still don't sign up would face hefty fines, starting at $750 a year for individuals and $1,500 for families. The maximum penalty on individuals would be $950.

Baucus is hoping his plan can win bipartisan support. A copy of his proposal was obtained by The Associated Press.